Lumped Element Multimode Modeling for a Sim- Plified Balanced-armature Receiver

Lumped element (LE) models normally used for balanced-armature receiver (BAR) are mainly based on the fundamental mode of its mechanical structure. For the lack of higher order modes, they may be insufficient to predict the system of BAR. Here we propose a LE multimode model aiming at improving the modeling of BAR. The model is developed based on the techniques of mode decomposition, truncation, and selection. Firstly, the mechanical structure of BAR is decoupled into a set of SDOF systems. Then the modes are truncated using the criterion of energy norm. Afterwards, the dominant modes are selected with DC gains of the concerned modes in the frequency range of interest. Finally, the LE multimode model is built for BAR using the determined dominant modes. The validation is made by comparing with both the corresponding combined FE-LE model and the full FE model. Simulation results prove the developed model is not only almost as effective as the combined FE-LE model, and also much more efficient.